Sensory organs:

SKIN :

SKIN The skin is made up of three layers- the epidermis , the dermis and the fatty layer. There are many different types of sensors in the skin. The number of sensors varies in different parts of our body. The sensitivity of the skin depends on two factors: The thickness of the epidermis The number of receptors

NOSE:

NOSE Smells are chemical in the air. The chemical dissolve in the moist lining of your nose . The nasal cavities have glands which produce a sticky fluid called mucus. A person having a cold cannot smell well. This is because the sensory cells are covered with a lot mucus and not much chemicals can reach and stimulate the sensory cells .

Tongue:

Tongue Your senses of taste and smell are closely linked. They are both chemical senses. You can only taste sweet, sour, bitter, and salty things. People think that they can taste other things but they are actually using their sense of smell . The sensors that give you your sense of taste are found in little grooves on your tongue. They are call taste buds .

Ears:

Ears The air around us is full of sound waves. HOW THE HUMAN EARS WORK

Eye:

Eye Light travels in a straight line. Light can travel through vacuum Light can be reflected and absorbed A periscope and a kaleidoscope uses the reflection of light Light can be refracted. Light is refracted when light travels from a medium to another medium.